[clang] [NFC][CLANG] Fix static analyzer bugs about unnecessary object copies with auto keyword (PR #86808)

[Cyndy Ishida via cfe-commits]

https://github.com/cyndyishida approved this pull request.

Can you condense the title to something more like `[clang-installapi] Remove unnecessary copy`? 


A couple of nits but in general looks good. Thanks for fixing this! 

https://github.com/llvm/llvm-project/pull/86808